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# Which of the following has magnesium ?

$(a)\;Chlorophyll\qquad(b)\;Carbonic\;anhydrase\qquad(c)\;Haernocyanin\qquad(d)\;Vitamin B_{12}$

Explanation :
Chlorophyll is an extremely important biomolecule , critical in photo synthesis . Chlorophyll is a chlorin pigment , which is structurally similar to and produced through the same metabolic path way as other prophyrin pigments . At the center of the chlorining is a magnesium ion .